android简易下拉刷新测试

public class MainActivity extends Activity implements OnRefreshListener {
	private List> list;
	private PullToRefreshListView listView;
	private MyAdapter adapter;
	private int count = 0;

	private Handler handler = new Handler() {
		@Override
		public void handleMessage(Message msg) {
			super.handleMessage(msg);
			switch (msg.what) {
			case 0:// 下拉刷新
				listView.onRefreshComplete();
				if (list.size() < 30)
					listView.setLoadMore(true);
				break;
			case 1:// 加载更多
				adapter.notifyDataSetChanged();
				listView.onRefreshComplete();
				if (list.size() >= 30)
					listView.setLoadMore(false);
				break;
			default:
				break;
			}
		}
	};

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		listView = (PullToRefreshListView) findViewById(R.id.listview);
		list = new ArrayList>();
		adapter = new MyAdapter(this, list);
		listView.setAdapter(adapter);
		listView.setOnRefreshListener(this);
		initListData();
	}

	public void getData() {
		Map map = new HashMap();
		map.put("image", R.drawable.ic_launcher);
		map.put("title", "这是标题" + count);
		map.put("info", "这是一个详细详细信息" + count);
		list.add(map);
		count++;
	}

	public void initListData() {
		handler.postDelayed(new Runnable() {
			@Override
			public void run() {
				getData();
				((BaseAdapter) adapter).notifyDataSetChanged();
				handler.sendEmptyMessage(0);
			}
		}, 10);
	}

	@Override
	public void onDownPullRefresh() {
		handler.postDelayed(new Runnable() {
			@Override
			public void run() {
				getData();
				((BaseAdapter) adapter).notifyDataSetChanged();
				handler.sendEmptyMessage(0);
			}
		}, 3000);
	}

	@Override
	public void onLoadingMore() {
		getData();
		handler.postDelayed(new Runnable() {
			@Override
			public void run() {
				getData();
				((BaseAdapter) adapter).notifyDataSetChanged();
				handler.sendEmptyMessage(1);
			}
		}, 3000);
	}
}

class PullToRefreshListView extends ListView implements OnScrollListener {
	private static final String TAG = "chenqy";
	private int firstVisibleItemPosition;
	private int downY;
	private int headerViewHeight;
	private int footerViewHeight;
	private View headerView;
	private View footerView;

	private final int DOWN_PULL_REFRESH = 0;
	private final int RELEASE_REFRESH = 1;
	private final int REFRESHING = 2;
	private int currentState = DOWN_PULL_REFRESH;

	private ProgressBar mProgressBar;
	private TextView tvState;

	private OnRefreshListener mOnRefershListener;
	private boolean isScrollToBottom;
	private boolean isLoadingMore = false;
	private boolean isLoadMore = true;

	// 实际的padding的距离与界面上偏移距离的比例，越大，拉的越费劲(阻尼系数，damping ratio)
	private final static float RATIO = 3.6f;

	public PullToRefreshListView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		init(context);
	}

	public PullToRefreshListView(Context context, AttributeSet attrs) {
		super(context, attrs);
		init(context);
	}

	public PullToRefreshListView(Context context) {
		super(context);
		init(context);
	}

	private void init(Context context) {
		initHeaderView(context);
		initFooterView(context);
		this.setOnScrollListener(this);
	}

	@Override
	public boolean onTouchEvent(MotionEvent ev) {
		switch (ev.getAction()) {
		case MotionEvent.ACTION_DOWN:
			downY = (int) ev.getY();
			break;
		case MotionEvent.ACTION_MOVE:
			int moveY = (int) ev.getY();
			int diff = (int) (((float) moveY - (float) downY) / RATIO);
			int paddingTop = -headerViewHeight + diff;
			if (firstVisibleItemPosition == 0 && diff > 0
					&& currentState != REFRESHING && !isLoadingMore) {
				if (paddingTop > 0 && currentState == DOWN_PULL_REFRESH) {
					currentState = RELEASE_REFRESH;
					tvState.setText("松开刷新");
				} else if (paddingTop < 0 && currentState == RELEASE_REFRESH) {
					currentState = DOWN_PULL_REFRESH;
					tvState.setText("下拉刷新");
				}
				headerView.setPadding(0, paddingTop, 0, 0); // 显示下拉移动效果
				return true;
			}
			break;
		case MotionEvent.ACTION_UP:
			if (currentState == RELEASE_REFRESH) {
				headerView.setPadding(0, 0, 0, 0);
				currentState = REFRESHING;
				mProgressBar.setVisibility(View.VISIBLE);
				tvState.setText("正在刷新中...");
				if (mOnRefershListener != null) {
					mOnRefershListener.onDownPullRefresh();
				}
			} else if (currentState == DOWN_PULL_REFRESH) {
				headerView.setPadding(0, -headerViewHeight, 0, 0);
			}
			break;
		default:
			break;
		}
		return super.onTouchEvent(ev);
	}

	@Override
	public void onScrollStateChanged(AbsListView view, int scrollState) {
		if (scrollState == SCROLL_STATE_IDLE || scrollState == SCROLL_STATE_FLING) {
			if (isScrollToBottom && !isLoadingMore && isLoadMore()
					&& currentState != REFRESHING) {
				isLoadingMore = true;
				Log.i(TAG, "加载更多数据-" + this.getCount());
				footerView.setPadding(0, 0, 0, 0);
				if (mOnRefershListener != null) {
					mOnRefershListener.onLoadingMore();
				}
			}
		}
	}

	@Override
	public void onScroll(AbsListView view, int firstVisibleItem,
			int visibleItemCount, int totalItemCount) {
		firstVisibleItemPosition = firstVisibleItem;
		if (getLastVisiblePosition() == (totalItemCount - 1)) {
			isScrollToBottom = true;
		} else {
			isScrollToBottom = false;
		}
	}

	private void initFooterView(Context context) {
		footerView = LinearLayout.inflate(context, R.layout.listview_foot, null);
		footerView.measure(0, 0);
		footerViewHeight = footerView.getMeasuredHeight();
		footerView.setPadding(0, -footerViewHeight, 0, 0);// 将底部隐藏
		this.addFooterView(footerView);
	}

	private void initHeaderView(Context context) {
		headerView = LinearLayout.inflate(context, R.layout.listview_header, null);
		mProgressBar = (ProgressBar) headerView
				.findViewById(R.id.pb_listview_header);
		tvState = (TextView) headerView.findViewById(R.id.tv_listview_header_state);
		headerView.measure(0, 0);
		headerViewHeight = headerView.getMeasuredHeight();
		headerView.setPadding(0, -headerViewHeight, 0, 0);// 将头部隐藏
		this.addHeaderView(headerView);
	}

	public void onRefreshComplete() {
		if (isLoadingMore) {
			hideFooterView();
		} else if (currentState == REFRESHING) {
			hideHeaderView();
		}
	}

	private void hideHeaderView() {
		headerView.setPadding(0, -headerViewHeight, 0, 0);
		mProgressBar.setVisibility(View.GONE);
		tvState.setText("下拉刷新");
		currentState = DOWN_PULL_REFRESH;
	}

	private void hideFooterView() {
		footerView.setPadding(0, -footerViewHeight, 0, 0);
		isLoadingMore = false;
	}

	public void setOnRefreshListener(OnRefreshListener listener) {
		mOnRefershListener = listener;
	}

	public interface OnRefreshListener {
		void onDownPullRefresh();

		void onLoadingMore();
	}

	public interface onDownPullRefresh {
		public void onRefresh();
	}

	public boolean isLoadMore() {
		return isLoadMore;
	}

	public void setLoadMore(boolean isLoadMore) {
		this.isLoadMore = isLoadMore;
	}
}

class MyAdapter extends BaseAdapter {

	private List> data;
	private LayoutInflater layoutInflater;

	public MyAdapter(Context context, List> data) {
		this.data = data;
		this.layoutInflater = LayoutInflater.from(context);
	}

	public final class ComponentView {
		public ImageView image;
		public TextView title;
		public Button view;
		public TextView info;
	}

	@Override
	public int getCount() {
		return data.size();
	}

	@Override
	public Object getItem(int position) {
		return data.get(position);
	}

	@Override
	public long getItemId(int position) {
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		ComponentView cv = null;
		if (convertView == null) {
			cv = new ComponentView();
			convertView = layoutInflater.inflate(R.layout.mylist, null);
			cv.image = (ImageView) convertView.findViewById(R.id.image);
			cv.title = (TextView) convertView.findViewById(R.id.title);
			cv.view = (Button) convertView.findViewById(R.id.view);
			cv.info = (TextView) convertView.findViewById(R.id.info);
			convertView.setTag(cv);
		} else {
			cv = (ComponentView) convertView.getTag();
		}
		cv.image.setBackgroundResource((Integer) data.get(position).get("image"));
		cv.title.setText((String) data.get(position).get("title"));
		cv.info.setText((String) data.get(position).get("info"));
		return convertView;
	}
}

main布局：

header布局：

foot布局：

list布局：

效果：